Field Guide to Noxious and Other Selected Weeds of British Columbia
Nodding Beggar-Ticks (Bidens cernua)
native annual weed of swampy areas, wet meadows and cranberry fields; erect stems, somewhat purplish in colour, grow 1 to 1.5 metres in height; yellow flowers, surrounded at base by leaf-like bracts, commonly droop or nod at maturity; four barbed horns on the seeds easily attach to clothing and animals
Devil's beggar-ticks (Bidens frondosa) is similar but has long-stalked leaves and only two horns on the seed
